Harmful chemicals enter into our body through biological magnification.

In the given figure,the various trophic levels are shown in the form of a pyramid. At which trophic level is maximum energy available and at which trophic level is the maximum number of organisms present?

Which is the primary factor responsible for the depletion of the ozone layer?

What are the advantages of cloth bags over plastic bags during shopping?

What is the difference between the food habits of organisms belonging to the second and fourth trophic levels? Give one example of organisms belonging to each of these two trophic levels.

Which radiations are prevented from reaching the Earth by the ozone layer?